Why is understanding sin willfully important for Christians?

Recognizing what it means to sin willfully is crucial for Christians as it highlights the consequences of despising the grace of God. In Hebrews 10:26-29, the author points out that willful sin entails a deliberate rejection of Christ after acknowledging the truth of the Gospel. This understanding serves as a warning against taking the grace of God lightly. For true believers, this acknowledgment fosters a deeper appreciation for Christ's work and compels them to rely solely on His grace rather than their works, maintaining a humble and dependent posture before God.